[css] How to draw a checkmark / tick using CSS?

After some changing to above Henry's answer, I got a tick with in a circle, I came here looking for that, so adding my code here.

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.snackbar_circle {
  background-color: #f0f0f0;
  border-radius: 13px;
  padding: 0 5px;
}

.checkmark {
  font-family: arial;
  font-weight: bold;
  -ms-transform: scaleX(-1) rotate(-35deg);
  -webkit-transform: scaleX(-1) rotate(-35deg);
  transform: scaleX(-1) rotate(-35deg);
  color: #63BA3D;
  display: inline-block;
}
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<span class="snackbar_circle">
   <span class="checkmark">L</span>
</span>
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